All30 June 20261 min read
The Relative Age Effect: The Hidden Bias in Youth Football Your Club Needs to Know About
At the FIFA U-17 Women's World Cup 2025, 56% of players were born in Q1 or Q2. The Relative Age Effect is real, it's significant — and it's costing grassroots clubs their best future players.
The Most Underreported Problem in Youth Football
At the FIFA U-17 Women's World Cup Morocco 2025, 56% of all 504 players were born in Q1 or Q2. Just 21% were born in Q4.
Why This Happens
In any birth year, a January-born child and a December-born child are placed in the same age group. But at age 10-12, 11 months of physical development is enormous. The January child looks more talented — bigger, faster, more coordinated — and gets selected, coached and given more game time.
What Grassroots Coaches Can Do
- Check birthdays when assessing players — a Q4 player behind a Q1 peer may have far greater long-term potential
- Ask: am I assessing footballing ability or physical maturity?
- Give late-born players equal opportunity
- Think long-term: physical development equalises. Football intelligence persists.
Source: FIFA Talent Development Scheme Insights — FIFA U-17 Women's World Cup Morocco 2025
